>For some reason which I can’t explain – while the Sony RX1 and Zeiss lens showed very smooth and pleasant bokeh, it somehow looked like the depth-of-field was slightly more than with the Nikon 35mm f/1.4 used at f/2

The Nikon does seem to have a more "3D effect" at f2 - any idea why that happens? I noticed that as well when shooting the RX1 - I love the bokeh, but it doesn't have as much DOF as I expected from a FF.